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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON R5 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration ( /L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-a MTBE MW3 11/11/97 854 Well dry -- -- __ __ __ -- MW3 03/03/98 854 1616 -762 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW3 03/03/98 854 <2 0* MW3 05/20/98 8 54 1602 -748 000 14 <0 5 <0 5 <0 5 170 <2 5 MW3 05/20/98 854 <2 0* MW3 08/19/98 854 1748 -894 000 5 9 2 2 <0 5 063 280 2 6 MW3 08/19/98 8 54 <2 0* MW3 11/18198 854 1793 -939 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW3 03/30/99 854 -- -- -- __ __ __ MW3 05/05/99 854 1640 -786 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW3 08/20/99 854 1785 -931 000 -- -- __ __ __ -- MW3 12/06/99 8 54 1802 -948 000 MW3 02/29100 854 1567 -7 13 000 MW3 05/16/00 854 1562 -708 000 -- -- -- __ __ -- MW3 09/11/00 854 1798 -944 000 7 3 84 5 9 1 1 5 220 <0 5 MW3 12/13/00 854 1760 -906 000 3 4 11 1 8 83 90 <0 5 MW3 03/08/01 854 1706 -852 000 <0 5 <0 5 <0 5 <0 5 210 <0 5 MW3 06/21/01 854 1842 -988 000 <0 5 <0 5 <0 5 <0 5 160 2 9 MW3 06/21/01 854 <5* MW3 09/20/01 8 54 1955 -1101 000 -- -- -- -- __ -- MW3 12/04/01 851 1935 -1084 000 077 <05 <05 <05 71 <5* MW3 03/05/02 851 1850 -999 000 2 60 100 0 50 160 290 h 760 MW3 03/05/02 851 <0 5* MW3 06/11102 851 1888 -1037 000 -- -- -- __ __ -- MW3 _MW3 09/10/02 8 51 2020 -1169 000 16 2 6 18 5 9 246 h 6 5 MW3 09/10/02 8 51 <0 5* MW3 12/18/02 851 1997 -1146 000 28 21 16 4 7 323 h <0 5 MW3 03/24/03 851 1940 -1089 000 -- -- -- -- -- -- MW3 03/25/03 851 -- -- -- 500 18 4 0 5 6 755 It <0 5 MW3 06/11/03 8 51 1956 -1105 000 182 61 148 123 1,510 It 344 MW3 06/11/03 8 51 <0 5* MW3 09/17/03 8.51 20.94 -12,43 0.00 9.20 6.2 12.4 16.7 1,510 It 26.8 NIW3 09/17/03 851 <0 5* 1pru)LLts1739421 iiasi�rl"plq(Y)0313942gw xis Page 7 of 47